2. DRIVE SYSTEM 2. DRIVE SYSTEM UNUSUAL NOISE COMES OUT OF PUMP CONNECTION UNUSUAL NOISE COMES OUT OF PUMP CONNECTION 1) 1) YES Remove dust plug under engine flywheel and check if rubber pieces or particles are not present. YES 5-5 Cause Remedy Coupling element is broken. Disassemble and repair. Replace hub or retighten setscrew. Coupling hub spline is worn or NO hub fastening setscrew is slack. If hydraulic pump or engine is NO suspected as a culprit refer to this manual "Structure and function".